Awesome, I’ll keep that in mind 
… just as long as they’re clean I would say!
This is really exactly what I was looking for anyways
Sorry - lost track of this thread.
Math is as explained. Nbully’s calculator is good - just be sure to look at your results and make sure it makes sense to double check your inputs. GIGO.
Clean the bottles well as explained above.
One more piece of advice. If you are doing your own mixes/composites - give them time to “ferment”. I usually leave mine about three days before using. I mean you can try to shake it really well, but there is something about just letting sit there and perc. I do not know if everyone subscribes to this theory but I have found it works best.
If in doubt read the Mad Tater journal. He is one of the masters at making mixes.
Olfact and Snoopyace also made threads about this.
There are several ways of doing this however,
The easiest way would be to multiply the desired strength per spray by the amount of molecules you have. Bosshank said it best to let it composite, and you’re all set.
Now if you were doing oil… that’s a whole different story